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By Adrien Hamelin | Mar 3, 2021 03:03 PM | Tags: c++20
First part.
Implementing Simple Futures with Coroutines
by Rainer Grimm
From the article:
Instead of return, a coroutine uses co_return returning its result. In this post, I want to implement a simple coroutine using co_return...
By Adrien Hamelin | Mar 3, 2021 03:01 PM | Tags: intermediate
Clarifying.
return first example
by Marius Elvert
From the article:
It seems my “return first” post was not as enlightening as I had hoped. It was posted on reddit, and while the majority of commenters completely missed the point, it wasn’t really clear for those that did not just read the title. Either way, I am to blame for that – the examples and my reasoning were not very conclusive. So let me try clearing up the confusion with a better example...
By Adrien Hamelin | Mar 3, 2021 02:54 PM | Tags: c++20
Harnessing the power of coroutines.
Creating a co_await awaitable signal that can be awaited multiple times, part 1
by Raymond Chen
From the article:
C++/WinRT asynchronous activities can be awaited only once. This is consistent with their intended usage pattern, which is for an application to start the activity, co_await the result, and then continue.
But maybe you want something like a Win32 event, where any number of people can co_await the event, and then once it is signaled, all the awaiters are resumed...
By Adrien Hamelin | Mar 2, 2021 03:34 PM | Tags: c++20
A new tool to simplify usage.
C++ Concepts: More than Syntactic Requirements
by Jonathan Boccara
From the article:
After years and years of expectation, concepts have finally made it in C++20.
Concepts are descriptions in code of a set of expressions that must be valid with a given type. Those are syntactic requirements. But there is more to concepts than that: concepts also have semantic requirements.
Before getting into that, here is a recap of what concepts are. If you’re already familiar with concepts you can skip to the section on semantic requirements...
By Adrien Hamelin | Mar 2, 2021 03:30 PM | Tags: c++20
Detailed and interesting.
My tutorial and take on C++20 coroutines
by David Mazières
From the article:
Over the last 25 years, I’ve written a lot of event-driven code in C++. A typical example of event-driven code is registering a callback that gets invoked every time a socket has data to be read. Once you have read an entire message, possibly after many invocations, you parse the message and invoke another callback from a higher layer of abstraction, and so forth. This kind of code is painful to write because you have to break your code up into a bunch of different functions that, because they are different functions, don’t share local variables...
By Adrien Hamelin | Mar 2, 2021 03:24 PM | Tags: community
Were you using them?
Next steps for Clang Power Tools
by Horatiu Prica
From the article:
We are happy to announce that Clang Power Tools is now entirely free for everyone while keeping it open-source on GitHub. We had a blast these past two years, working full-time on making Clang Power Tools better and bringing to fruition its code modernization mission...
By Adrien Hamelin | Mar 1, 2021 02:03 PM | Tags: None
Are you using vcpkg?
Registries: Bring your own libraries to vcpkg
by Nicole Mazzuca
From the article:
Are you working on a C++ project with library dependencies? Are you tired of maintaining a custom-built package management workflow with duct tape and git submodules? Then you should consider trying out a package manager. Perhaps you have been side-eyeing vcpkg for a while, and it looks like the perfect solution for your team, but for one problem: not all your dependencies are open source! Your company has internal libraries that they expect everyone to use too...
By Adrien Hamelin | Mar 1, 2021 01:59 PM | Tags: c++20
Another aspect of c++20.
Synchronized Output Streams with C++20
by Rainer Grimm
From the article:
What happens when you write without synchronization to std::cout? You get a mess. With C++20, this should not be anymore...
By Adrien Hamelin | Mar 1, 2021 01:57 PM | Tags: community
Interested?
CLion 2021.1 EAP: Postfix Completion for C and C++
by Anastasia Kazakova
From the article:
A new CLion 2021.1 EAP build (211.6085.16) is now available from our website, via the Toolbox App, or as a snap package (if you are using Ubuntu). Note that if you are on macOS, there is a separate build for Apple Silicon (M1 chip)...
By Administrator | Feb 28, 2021 01:53 PM | Tags: None
The 2021-02 mailing of new standards papers is now available.
| WG21 Number | Title | Author | Document Date | Mailing Date | Previous Version | Subgroup |
|---|---|---|---|---|---|---|
| N4880 | PL22.16/WG21 agenda: 22 February 2021, Virtual Meeting | John Spicer | 2021-01-23 | 2021-02 | All of WG21 | |
| N4881 | WG21 virtual meetings: 2021-02, -06, and -10 | Herb Sutter | 2021-02-08 | 2021-02 | All of WG21 | |
| N4882 | WG21 admin telecon meetings: 2021-02, -05, and -09 | Herb Sutter | 2021-02-08 | 2021-02 | All of WG21 | |
| N4883 | WG21 February 2021 admin telecon minutes | Nina Ranns | 2021-02-16 | 2021-02 | All of WG21 | |
| P0401R6 | Providing size feedback in the Allocator interface | Chris Kennelly | 2021-02-15 | 2021-02 | P0401R5 | LWG Library |
| P0448R3 | A strstream replacement using span as buffer | Peter Sommerlad | 2021-02-17 | 2021-02 | P0448R2 | LWG Library |
| P0849R7 | auto(x): decay-copy in the language | Zhihao Yuan | 2021-02-15 | 2021-02 | P0849R6 | EWG Evolution,LWG Library |
| P1018R8 | C++ Language Evolution status pandemic edition 2020/11–2021/01 | JF Bastien | 2021-01-27 | 2021-02 | P1018R7 | EWG Evolution,All of WG21 |
| P1072R7 | basic_string::resize_and_overwrite | Chris Kennelly | 2021-02-15 | 2021-02 | P1072R6 | LWG Library |
| P1322R3 | Networking TS enhancement to enable custom I/O executors | Christopher Kohlhoff | 2021-02-14 | 2021-02 | P1322R2 | SG4 Networking,LEWG Library Evolution |
| P1425R3 | Iterators pair constructors for stack and queue | Corentin Jabot | 2021-02-18 | 2021-02 | P1425R2 | LEWG Library Evolution,LWG Library |
| P1659R2 | starts_with and ends_with | Christopher Di Bella | 2021-02-10 | 2021-02 | P1659R1 | LWG Library |
| P1659R3 | starts_with and ends_with | Christopher Di Bella | 2021-02-19 | 2021-02 | P1659R2 | LWG Library |
| P1682R3 | std::to_underlying | JeanHeyd Meneide | 2021-01-22 | 2021-02 | P1682R2 | LWG Library |
| P1885R5 | Naming Text Encodings to Demystify Them | Corentin Jabot | 2021-02-15 | 2021-02 | P1885R4 | SG16 Unicode,LEWG Library Evolution |
| P1951R1 | Default Arguments for pair's Forwarding Constructor | Logan R. Smith | 2021-02-21 | 2021-02 | P1951R0 | LWG Library |
| P2047R1 | An allocator-aware optional type | Nina Ranns | 2021-02-19 | 2021-02 | P2047R0 | LEWGI SG18: LEWG Incubator,LEWG Library Evolution |
| P2066R5 | Suggested draft TS for C++ Extensions for Minimal Transactional Memory | Jens Maurer | 2021-02-14 | 2021-02 | P2066R4 | SG1 Concurrency and Parallelism,SG5 Transactional Memory,EWG Evolution,LEWG Library Evolution |
| P2093R4 | Formatted output | Victor Zverovich | 2021-02-15 | 2021-02 | P2093R3 | LEWG Library Evolution |
| P2128R3 | Multidimensional subscript operator | Corentin Jabot | 2021-02-15 | 2021-02 | P2128R2 | EWG Evolution |
| P2162R2 | Inheriting from std::variant (resolving LWG3052) | Barry Revzin | 2021-02-17 | 2021-02 | P2162R1 | LEWG Library Evolution |
| P2164R4 | views::enumerate | Corentin Jabot | 2021-02-18 | 2021-02 | P2164R3 | LEWG Library Evolution |
| P2195R2 | Electronic Straw Polls | Bryce Adelstein Lelbach | 2021-01-27 | 2021-02 | P2195R1 | All of WG21 |
| P2216R3 | std::format improvements | Victor Zverovich | 2021-02-15 | 2021-02 | P2216R2 | LWG Library |
| P2231R1 | Add further constexpr support for optional/variant | Barry Revzin | 2021-02-11 | 2021-02 | P2231R0 | LEWG Library Evolution |
| P2234R1 | Consider a UB and IF-NDR Audit | Scott Schurr | 2021-02-13 | 2021-02 | P2234R0 | SG12 Undefined and Unspecified Behavior,EWGI SG17: EWG Incubator |
| P2242R1 | Non-literal variables (and labels and gotos) in constexpr functions | Ville Voutilainen | 2021-02-14 | 2021-02 | P2242R0 | EWG Evolution,CWG Core |
| P2249R0 | Mixed comparisons for smart pointers | Giuseppe D'Angelo | 2021-01-30 | 2021-02 | LEWGI SG18: LEWG Incubator,LEWG Library Evolution | |
| P2280R1 | Using unknown references in constant expressions | Barry Revzin | 2021-02-15 | 2021-02 | P2280R0 | EWG Evolution |
| P2281R1 | Clarifying range adaptor objects | Tim Song | 2021-02-19 | 2021-02 | P2281R0 | LWG Library |
| P2286R1 | Formatting Ranges | Barry Revzin | 2021-02-19 | 2021-02 | P2286R0 | LEWG Library Evolution |
| P2287R1 | Designated-initializers for base classes | Barry Revzin | 2021-02-15 | 2021-02 | P2287R0 | EWG Evolution |
| P2289R0 | 2021 Winter Library Evolution Polls | Bryce Adelstein Lelbach | 2021-01-31 | 2021-02 | LEWG Library Evolution | |
| P2290R0 | Delimited escape sequences | Corentin Jabot | 2021-02-18 | 2021-02 | SG22 Compatability,EWG Evolution | |
| P2291R0 | Add Constexpr Modifiers to Functions to_chars and from_chars for Integral Types in Header | Daniil Goncharov | 2021-01-28 | 2021-02 | LEWGI SG18: LEWG Incubator,LEWG Library Evolution,LWG Library | |
| P2295R0 | Correct UTF-8 handling during phase 1 of translation | Corentin Jabot | 2021-02-15 | 2021-02 | SG16 Unicode,SG22 Compatability,EWG Evolution | |
| P2297R0 | Wording improvements for encodings and character sets | Corentin Jabot | 2021-02-19 | 2021-02 | SG16 Unicode | |
| P2301R0 | Add a pmr alias for std::stacktrace | Steve Downey | 2021-02-15 | 2021-02 | LEWG Library Evolution,LWG Library | |
| P2302R0 | Prefer std::ranges::contains over std::basic_string_view::contains | Christopher Di Bella | 2021-02-10 | 2021-02 | LEWG Library Evolution | |
| P2303R0 | Function literals and value closures | Jens Gustedt | 2021-02-10 | 2021-02 | SG22 Compatability | |
| P2304R0 | Improve type generic programming | Jens Gustedt | 2021-02-10 | 2021-02 | SG22 Compatability | |
| P2305R0 | Type inference for variable definitions and function returns | Jens Gustedt | 2021-02-10 | 2021-02 | SG22 Compatability | |
| P2306R0 | Type-generic lambdas | Jens Gustedt | 2021-02-10 | 2021-02 | SG22 Compatability | |
| P2307R0 | Lvalue closures | Jens Gustedt | 2021-02-10 | 2021-02 | SG22 Compatability | |
| P2309R0 | A common C/C++ core specification | Jens Gustedt | 2021-02-11 | 2021-02 | SG22 Compatability | |
| P2310R0 | Revise spelling of keywords | Jens Gustedt | 2021-02-11 | 2021-02 | SG22 Compatability | |
| P2311R0 | Make false and true first-class language features | Jens Gustedt | 2021-02-11 | 2021-02 | SG22 Compatability | |
| P2312R0 | Introduce the nullptr constant | Jens Gustedt | 2021-02-15 | 2021-02 | SG22 Compatability | |
| P2314R0 | Character sets and encodings | Jens Maurer | 2021-02-12 | 2021-02 | SG16 Unicode,EWG Evolution | |
| P2315R0 | C++ Standard Library Issues to be moved in Virtual Plenary, Feb. 2021 | Jonathan Wakely | 2021-02-12 | 2021-02 | All of WG21 | |
| P2316R0 | Consistent character literal encoding | Corentin Jabot | 2021-02-18 | 2021-02 | SG22 Compatability,EWG Evolution | |
| P2317R0 | C++ - An Invisible foundation of everything | Bjarne Stroustrup | 2021-02-14 | 2021-02 | All of WG21 | |
| P2320R0 | The Syntax of Static Reflection | Andrew Sutton | 2021-02-15 | 2021-02 | SG7 Reflection | |
| P2321R0 | zip | Tim Song | 2021-02-20 | 2021-02 | LEWG Library Evolution | |
| P2322R0 | ranges::fold | Barry Revzin | 2021-02-18 | 2021-02 | LEWG Library Evolution | |
| P2323R0 | maybe_unused attribute for labels | Martin Uecker | 2021-02-16 | 2021-02 | SG22 Compatability | |
| P2324R0 | Labels at the end of compound statements (C compatibility) | Martin Uecker | 2021-02-16 | 2021-02 | SG22 Compatability | |
| P2325R0 | Views should not be required to be default constructible | Barry Revzin | 2021-02-17 | 2021-02 | LEWG Library Evolution |